Table 2.

Response of rice yield, CH₄ and N₂O on some selected initial soil and biochar properties using a multilinear regression model.

Variables	Estimates	95 % confidence interval		p-value
		Lower limit	Upper limit
Rice yield				3.6e-06
Intercept	−0.33	−4.20	3.52	0.86
Soil pH	1.00	0.43	1.56	0.00
Soil_TN	0.85	−0.32	2.04	0.15
Soil_OC	0.03	−0.05	0.11	0.46
B_TN	0.08	−0.01	0.18	0.07
CH4emission				2.9e-06
Intercept	278.15	64.34	491.97	0.01
Soil pH	13.54	−6.62	33.71	0.19
Soil_TN	−52.48	−92.29	12.68	0.01
Soil_OC	4.42	1.78	7.07	0.001
pH biochar	−26.22	−39.60	12.85	0.00
B_TN	6.69	2.93	10.46	0.00
B_OC	−0.12	−0.26	0.01	0.08
N2O emission				3.6e-06
Intercept	3.97	1.68	6.26	0.00
B_TN	0.06	0.01	0.10	0.02
Soil_TN	−1.72	−2.43	−1.02	4.8e-06
Soil_OC	0.08	0.02	0.13	0.01
pH biochar	−0.19	−0.41	−0.03	0.10

pH_soil = soil pH, B_TN = biochar total nitrogen (g/kg), pH_biochar = biochar pH, soil_OC = soil organic carbon (g/kg), B_OC = biochar organic carbon (g/kg), and soil_TN = soil total nitrogen.